The game will participate in the Steam Next Fest. The demo version is (probably, if you see the green button) available right now!
The current demo version is 0.11. It includes two levels. Tutorial and all game's main features are implemented in it.
If you had played the 0.1 version, you've already seen all demo content. But the quality of the game was improved from back then.
If you want to give me feedback, please fill this form or just create a thread in the community.